Stack draft control apparatus



March 29, 1932. -rm 1,851,318

STACK DRAFT CONTROL APPARATUS Filed May 1, 1931 a ATTORNEYS.

' the drawings to deflect fly ash or dust in the Patented Mar. 29, 1932 IRA 'l. T MARTIN; -SAN' FRANClISGO, CALIFORNIA STACK =DRAET CONTROL APPARATUS,

Application filed flay 1,1931. Serial No. 534,159.

This invention relates to stack draft control apparatus of the type shown in my U; S; 1 PatentfNo. 1,798,1221ofMarch 24, 1931, and

.;,has for its objects improvements inthe water 5tank arrangement thereof.

In the drawings accompanying this application. Fig. l is an elevation of apart of smoke stackand side outlet'extending into a watertank, the latter being shown in section;

10" Fig. 2. is a plan view of the water tank only.

In further" detail, 1 represents part ofa smoke stack of any size, height, orconstruc tion, fitted with a laterally extending and downwardly turned side outlet or return bend at 15"2 which projects downward into a water tank 3 and there terminates, preferably at an angle to the horiontal as indicated at 2.

This return bend branches from the stack at a point sufi'iciently elevated to secure a proper draft when the extreme upper end of the stack is shut off by means of a damper 4, preferably a solid one, operated by handle 5.

Another damper 6'is provided within the bend for opening or shutting off the same, or opening-to the angular position as dotted in stack gases toward the outer wall of the bend. Thesedampers may be operated by remote control as shown in desired.

The tank here shown is circular, supported on a rigid frame 7 and providedwith a conical bottom'3 fitted with a central drain pipe 8 and valve 9.

Water may be maintained at any desired level within'the tank by means of a pipe 1O entering the side of the tank and receiving,

water from a supply .pipe 11 valved at 12. Pipe 10 extends belowthe water supply pipe as at 13 and is valved at 14, so that by Inanipulating the valves the water-may be introduced from pipe 11, orrun off to lower thelevel from pipe13. The'operatinglevel V of the Water is usually maintained at about the line 15, and dropped a little to increase the draft or raised to gradually shut off the shaft all as explained in my priorpatent. Any other arrangement of water piping may be used to control the height of the water if 'desired. v

Lmy patent aforesaid if The tank'is usually made of'iron and pref: erably coated with a heavy coat of'tar or acid-resisting paint,whilewithin the tank is a heavy iron'ring or collar 16 suspendedon acid-resisting or tar-painted hangers 17, hooked over the up'per edgesof the tank; Iron ring 16 is preferably made in overlapping sections, and'bolted together by bolts 18 at timeof placing intopositiomand when in place the 'ringextends bothlabove and below the normal water level line 15; o

Also 'in the tank is aheavy unprotected i ironperforated disk 19 fit'ted with alowering ring 20- and a depending bar 21 .whifch finds and tank 3 I introduce a layer of'heavy mineral oil Orliquid tar 22 .to float on'the water and thereby restore thepaintor coating on the tank as the waterlevel rises' and falls; The construction also permits'reduction of effective diameter of a tank to any degree surrounding the return bend so that'th'e work-f ing area of the water. may besuited to the particular installation. In operation the flue gases. strike the sur face ofthe waterwtodepressitslightlyih;

making the outward turn to escape while a: spray-is generated'and thrown outwardly against the inside of the collar l6,while the fly ash or dust being entrapped by the water will settle through the perforated disk 19 and after filling up pipe 8 will tendto bank I up in the tank" as shown in 23, and wlien'the waterand settled matteris drawn; offfthrough' pipe 8" the latter will all pass through the disk so that'any acid which the mass contains may acting-upon the disk.

the drawings at f ecome neutralized The water" becomes so-acrd from the film;

gases passing over and mixing with it that it is difiicult to keep the tank from being eaten up, but by painting the tank and providing the unprotected iron or other easily attached collar or ring 16 surrounding the return bend 2 the acid spray is all thrown against it, and the body of water at its juncture to the air where it is more active is always presented to the iron of the inner face of the collar for neutralizing and the formation of salts, so that in consequence the tank 3 lasts almost indefinitely.

When necessary to renew the collar, this may easily be done without touching the return bend by undoing bolts 18.

Having thus described my invention I claim 1. Stack draft control apparatus comprising a tank, a downwardly directed stack outlet extending into said tank, and means, presenting a surface for ready action thereon by an acid arranged within said tank between its inner surface and the downwardly direct ed stack, whereby the energy of acids developed in the tank will be neutralized.

2. Stack draft control apparatus comprising a tank, a downwardly directed stack outlet extending into said tank, and a collar-like device of acid attackable material between said tank and the downwardly directed stack.

3. Stack draft control apparatus comprising a tank, a downwardly directed stack outlet extending into said tank, and a collar-like device of iron between said tank and the downwardly directed stack exposed to attack of acid in the tank.

4. In a construction as specified in claim 3, said collar-like device of iron supported on hangers suspended from the tank.

5. In a construction as specified in claim 3, said collar-like device of iron assembled in separable sections all supported on hangers suspended from the tank.

6. Stack draft control apparatus including a tank into which the end of the stack is downwardly directed, and a collar of bare metal spaced within the tank and outward from the end of the stack.

7. Stack draft control apparatus including a tank into which the end of the stack is downwardly directed, and a collar of bare metal spaced within the tank and outward from the end of the stack, said tank containin g water for control, through ch ange of level, of the stack draft. and a charge of oil on said water between said collar and said tank.

8. Stack draft control apparatus including a tank into which the end of the stack is downwardly directed, said tank having a conv ical bottom provided with a lower drain pipe, and a strainer of exposed acid attackable material in the cone.

9. Stack draft control apparatus including a tank into which the end of the stack is downwardly directed, said tank having a conical bottom provided with a lower drain pipe, and a strainer of exposed acid attackable material in the cone provided with a locating pin extending into said pipe.

10. Stack draft control apparatus including a water tank into which the end of a downwardly extending stack outlet is directed, means for varying the water level in said tank for controlling the stack draft, a collarlike device of iron spaced around the stack extending above and below the water level to react with the acid developed in the water from contact with the stack gases.

11. Stack draft control apparatus including a water tank into which the end of a downwardly extending stack outlet is directed, means for varying the water level in said tank for controlling the stack draft, acollarlike device of iron spaced around the stack extending above and below the water level to react with the acid developed in the water from contact with the stack gases, a drain from the lower part of the tank, and an iron device above the drain exposed for attack of acid in tank contents passing to drain.

IRA T. MARTIN. 

